There is nothing with the series that is really pausing, in that I mean, there is no smoking, swearing, violence, etc. However, I think it does provide a poor message to younger children and should be saved for what I would call that "mid" range.
The poor message is the family dynamic. When I was a kid, we were allowed to go disappear all day and not check in until dinner, but that isn't the same world today. Also we could be trusted, and the Rocket kids cannot. They are always disobeying rules, sometimes to dangerous results; and there are very few repercussions when they do. They lie frequently and are constantly trying to skirt around their single father's authority in a way that is not just normal rebellion.
The father seems more interested in preserving his youth and trying to compete with kids that he does very little actual parenting, seeming surprised when his children lie or break every rule he lays, as if it has happened for the first time. He also seems more wrapped up in his own interests to notice when he is actually missing the times when his kids need him (Such as, when he becomes in a woman that comes to town and completely ignores his daughter, while she grows increasingly upset, feeling she has been forgotten. It is actually the woman who just entered the situation that notices the problem.)
Even though it tries to promote an anti-bullying message, the main characters frequently bully their nerdy friend, while the older kids bully them. Once again, there are no repercussions.
If it were my children, I would just pass this one up entirely. There are many other series with positive messages and the same action and humor that would be a much better use of your kids' time.